WO2023095430A1 - Inductor - Google Patents

Inductor Download PDF

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Publication number
WO2023095430A1
WO2023095430A1 PCT/JP2022/035256 JP2022035256W WO2023095430A1 WO 2023095430 A1 WO2023095430 A1 WO 2023095430A1 JP 2022035256 W JP2022035256 W JP 2022035256W WO 2023095430 A1 WO2023095430 A1 WO 2023095430A1
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Prior art keywords
coil element
external electrode
inductor
coil
magnetic core
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PCT/JP2022/035256
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French (fr)
Japanese (ja)
Inventor
潔 高木
祐介 中村
正博 榎本
浩史 冨田
理 下村
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パナソニックＩｐマネジメント株式会社
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Publication of WO2023095430A1 publication Critical patent/WO2023095430A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances

Definitions

  • the present disclosure relates to inductors used in power supply circuits and the like.
  • a multi-phase power supply system has been mainly used in order to cope with the increase in current. Therefore, a coupling system has been used as a power supply system corresponding to this system.
  • the inductor used in this coupling system is driven by an inductor in which a plurality of coils are coupled with a coupling coefficient of about 0.6.
  • Patent Document 1 is known as prior art document information.
  • An object of the present disclosure is to provide an inductor that is small, can handle large currents, and has a large coupling coefficient.
  • the inductor of the present disclosure includes a rectangular parallelepiped magnetic core obtained by mixing magnetic material powder and a binder and press-forming, and a coil element embedded in the magnetic core.
  • the magnetic core has a bottom surface, a top surface facing the bottom surface, a first side surface connecting the bottom surface and the top surface, and a second side surface facing the first side surface.
  • At least four coil elements are provided to overlap the first coil element, the second coil element, the third coil element, and the fourth coil element in order from the first side surface side toward the second side surface side.
  • a first coil element, a second coil element, a third coil element, and a fourth coil element are stacked in order from the first side surface side to the second side surface side.
  • the ends of the first to fourth coil elements protrude from the bottom surface and are bent along the bottom surface to form external electrodes.
  • the external electrode connected to the first coil element is the first external electrode
  • the external electrode connected to the second coil element is the second external electrode
  • the external electrode connected to the third coil element is the third external electrode
  • the fourth The external electrode connected to the coil element of is the fourth external electrode.
  • a first external electrode and a third external electrode are provided by bending each end of the first coil element and each end of the third coil element toward the first side surface.
  • Each end of the second coil element and each end of the fourth coil element are bent toward the second side surface to provide a second external electrode and a fourth external electrode, respectively.
  • FIG. 1 is a perspective view of an inductor according to an embodiment of the present disclosure
  • FIG. Side view of an inductor according to an embodiment of the present disclosure A bottom view of an inductor according to an embodiment of the present disclosure
  • FIG. 4 is an end view of an inductor in accordance with an embodiment of the present disclosure
  • FIG. 2 is a top perspective view when the inductor according to the embodiment of the present disclosure is mounted on a mounting substrate and used;
  • FIG. 4 is a plan view of a first coil element of an inductor according to an embodiment of the present disclosure; A plan view of a second coil element of an inductor according to an embodiment of the present disclosure A plan view of a third coil element of an inductor according to an embodiment of the present disclosure A plan view of a fourth coil element of an inductor according to an embodiment of the present disclosure
  • FIG. 11 is a bottom side external view of an inductor in a modification of an embodiment of the present disclosure;
  • FIG. 5 is a top perspective view when the inductor in the modified example of the embodiment of the present disclosure is mounted on a mounting substrate and used;
  • FIG. 1 is a perspective view of the inductor 10 viewed from the bottom surface 11a side of the inductor 10 according to the embodiment of the present disclosure.
  • 2A to 2C are external views of inductor 10 according to an embodiment of the present disclosure.
  • FIG. 2A is a side view of inductor 10 viewed from the first side surface 11c side of inductor 10 according to an embodiment of the present disclosure.
  • FIG. 2B is a bottom view of the inductor 10 viewed from the side of the bottom surface 11a of the inductor 10.
  • FIG. FIG. 2C is an end view of the inductor 10 viewed from the first end face 11f side of the inductor 10.
  • FIG. 2A to 2C the internal coil element 12 is indicated by broken lines.
  • FIGS. 1 to 6 show an xyz orthogonal coordinate system.
  • An inductor 10 includes a rectangular parallelepiped magnetic core 11 formed by mixing a magnetic material powder made of Fe—Si—Cr powder and a binder made of silicone and press-molding the magnetic core 11. and an embedded coil element 12 .
  • the outer shape of the magnetic core 11 is a rectangular parallelepiped with a width (y-axis direction) of about 6 mm, a length (x-axis direction) of about 13 mm, and a height (z-axis direction) of about 5 mm.
  • the magnetic core 11 includes a bottom surface 11a from which the ends of the coil elements 12 protrude, a top surface 11b facing the bottom surface 11a, a first side surface 11c connecting the bottom surface 11a and the top surface 11b, and a first side surface 11c. , a first end face 11e connecting the first side face 11c and the second side face 11d, and a second end face 11f facing the first end face 11e. .
  • each coil element 12 each made of a flat plate are embedded inside the magnetic core 11 .
  • a first coil element 12a, a second coil element 12b, a third coil element 12c, and a fourth coil element 12d are arranged in order from the first side surface 11c side of the magnetic core 11 toward the second side surface 11d side, Adjacent coil elements are embedded such that the side surfaces thereof are opposed to each other.
  • An end portion of each coil element 12 protrudes from the bottom surface 11a of the magnetic core 11 and is bent along the bottom surface 11a to form an external electrode 13 .
  • Each coil element 12 is formed by punching a copper plate, and has a thickness of about 0.4 mm and a coil pattern width of about 0.8 mm.
  • an insulating layer 16 made of epoxy resin, phenol resin, acrylic resin, or the like and having a thickness of about 0.03 mm is provided by pad printing or the like.
  • the external electrode connected to the first coil element 12a is the first external electrode 13a
  • the external electrode connected to the second coil element 12b is the second external electrode 13b
  • the external electrode connected to the third coil element 12c is the third external electrode.
  • An external electrode connected to the third external electrode 13c and the fourth coil element 12d is called a fourth external electrode 13d.
  • Each end of the first coil element 12a and each end of the third coil element 12c are bent toward the first side surface 11c to form the first external electrode 13a and the third external electrode 13c, respectively.
  • Each end of the second coil element 12b and each end of the fourth coil element 12d are bent toward the second side surface 11d to form the second external electrode 13b and the fourth external electrode 13d, respectively.
  • each of the first external electrode 13a, the second external electrode 13b, the third external electrode 13c, and the fourth external electrode 13d extends in the direction of the first end surface 11e or the second end surface 11f, that is, along the x-axis. direction, and the tip portion is bent along the first end surface 11e or the second end surface 11f.
  • Inductor 10 with a small mounting area can be obtained by forming external electrode 13 by bending the ends of coil element 12 so as to protrude from bottom surface 11a.
  • the bottom surface 11a of the magnetic core 11 is provided with a recess 15 having a depth of about 0.4 mm in a region that includes a portion where the coil element 12 protrudes and connects the first side surface 11c and the second side surface 11d. If the end of the coil element 12 protrudes from the bottom surface 11a and is bent along the bottom surface 11a, the bent portion inevitably bulges, resulting in poor mounting stability. Therefore, by protruding the ends of the coil elements 12 from the recesses 15 provided in the bottom surface 11a of the magnetic core 11 as in the present embodiment, the flatness of the mounting surface of the inductor can be improved.
  • the depth of the concave portion 15 is desirably 80% or more and 200% or less of the thickness of the external electrode 13 . If the depth of the concave portion is shallower than 80% of the thickness of the external electrode, the flatness is deteriorated. Conversely, if it exceeds 200%, the volume of the core becomes small and the inductance value decreases, which is not preferable.
  • the inductor 10 is configured as described above.
  • FIG. 3 is a top perspective view when the inductor 10 of the present disclosure is mounted on the mounting board 17 and used.
  • FIG. 3 shows an example of use in a three-phase multiphase voltage regulator.
  • One inductor 10 is used for each phase.
  • FIG. 3 shows the periphery of three inductors 10 of a three-phase multiphase voltage regulator.
  • the three inductors 10 are arranged such that the first side 11c and the second side 11d face each other.
  • a pad 18a and a pad 18b are provided on the mounting board 17 for each inductor.
  • the mounting board 17 is indicated by a dashed line
  • the pads 18a and 18b are indicated by broken lines
  • the magnetic core 11 is indicated by long broken lines
  • the first to fourth external electrodes 13a to 13d are indicated by solid lines.
  • Adjacent first external electrode 13a and third external electrode 13c on mounting substrate 17 are connected by pad 18a to form first inductor 10A, and adjacent second external electrode 13b and fourth external electrode are connected.
  • the electrode 13d is connected with the pad 18b to form the second inductor 10B.
  • the second coil element 12b which is the second inductor 10B, is sandwiched between the first coil element 12a, which is the first inductor 10A, and the third coil element 12c.
  • the third coil element 12c which is the first inductor 10A, is sandwiched between the second coil element 12b, which is the inductor 10B, and the fourth coil element 12d. Further, one coil element 12 (any one of the first coil element 12a to the fourth coil element 12d) is connected to at least one other coil element 12 ( At least one of the first coil element 12a to the fourth coil element 12d), so that the inductor 10 having a high coupling coefficient between the first inductor 10A and the second inductor 10B can be obtained. can be done.
  • the wiring pattern 19a is indicated by a dotted line
  • the wiring pattern 19b is indicated by a two-dot chain line.
  • the wiring pattern 19a is connected to a regulator circuit for each phase of the multiphase voltage regulator.
  • the wiring pattern 19b connects the three second inductors 10B in series.
  • the wiring patterns 19b at both ends to which the three second inductors 10B are connected in series are each connected to the ground (GND).
  • GND ground
  • FIG. 4A is a plan view of the first coil element 12a
  • FIG. 4B is a plan view of the second coil element 12b
  • FIG. 4C is a plan view of the third coil element 12c
  • FIG. 4D is a plan view of the fourth coil element 12d.
  • FIGS. 4A to 4D broken lines show the outer shape of the magnetic core 11 when the first to fourth coil elements 12a to 12d are embedded in the magnetic core 11.
  • FIG. The ends of the first to fourth coil elements 12a to 12d protruding outside the dashed line are embedded and then bent along the bottom surface 11a to form the first external electrodes 13a to the fourth coil elements 13a to 4th coil elements 12d, respectively. constitute the external electrode 13d.
  • the boundaries between the first to seventh portions are indicated by dashed lines in order to make the regions of the first to seventh portions easier to understand.
  • each of the first coil element 12a to the fourth coil element 12d has the configuration shown in (a) to (g) below.
  • a third portion 12g connected to the end of the second portion 12f on the top surface 11b side and the first end surface 11e side and extending toward the top surface 11b side.
  • a fifth portion 12i connected to the end of the fourth portion 12h on the bottom surface 11a side and the second end surface 11f side and extending toward the bottom surface 11a side.
  • a sixth portion 12j connected to the end of the fifth portion 12i on the bottom surface 11a side and extending toward the first end surface 11e.
  • a seventh portion 12k connected to the end of the sixth portion 12j on the bottom surface 11a side and the first end surface 11e side and extending toward the bottom surface 11a side.
  • the ends of the first to fourth coil elements 12a to 12d on the side of the bottom surface 11a project from the ends of the first portion 12e and the seventh portion 12k to the bottom surface 11a of the magnetic core 11, By bending along the bottom surface 11a of the magnetic core 11, the first to fourth external electrodes 13a to 13d are formed, respectively.
  • the lengths of the second portion 12f and the sixth portion 12j (L1 in FIG. 4A) of the first coil element 12a and the second coil element 12b are equal to those of the third coil element 12c and the fourth coil element 12d. is longer than the width of the coil pattern compared to the lengths of the second portion 12f and the sixth portion 12j (L2 in FIG. 4C).
  • the first coil element 12a and the second coil element 12b overlap in all paths embedded in the magnetic core 11, and the third coil element 12c and the fourth coil element 12d are embedded in the magnetic core 11. are overlapped in all paths that are Furthermore, in the third portion 12g to the fifth portion 12i, the first coil element 12a, the second coil element 12b, the third coil element 12c, and the fourth coil element 12d all overlap. By doing so, a large coupling coefficient can be obtained between the first inductor 10A and the second inductor 10B.
  • the third coil element 12c and the fourth coil element 12d do not form the first, second, sixth, and seventh parts, but extend the third part and the fifth part to the bottom surface. Although it may be formed, it is preferable that at least a part of the second and sixth portions of each coil element overlap each other because the coupling coefficient between the plurality of coils can be increased. Also, in FIGS. 4A to 4D, the loops of the coils are rectangular, but the loops may be rounded ⁇ -shaped.
  • a region is formed on the bottom surface 11a in which the end of the second coil element 12b and the end of the third coil element 12c are closely opposed to each other. If the end portions of the second coil element 12b and the end portions of the third coil element 12c are conductive in these opposing regions, short circuits are likely to occur during mounting. Therefore, it is desirable to provide the insulating layer 14 in the region where the end of the second coil element 12b and the end of the third coil element 12c face each other. In FIG. 2B, the portion where the insulating layer 14 is provided is hatched for easy understanding. It is desirable that this insulating layer 14 be provided at the same time as the insulating layer is formed on the coil element 12 in the portion embedded in the magnetic core 11 . By doing so, the process can be simplified.
  • FIG. 5 shows a bottom external view of inductor 10 viewed from the bottom surface 11a side of inductor 10 in a modification of the embodiment of the present disclosure.
  • FIG. 6 is a perspective top view of the inductor 10 according to this modification when it is mounted on a mounting board 17 and used.
  • the example of use shown in FIG. 6 shows an example of use in a three-phase multiphase voltage regulator, like the example of use described in FIG. One inductor 10 is used for each phase.
  • FIG. 6 shows the periphery of three inductors 10 of a three-phase multiphase voltage regulator.
  • the three inductors 10 are arranged such that the first side 11c and the second side 11d face each other.
  • a pad 18a and a pad 18b are provided on the mounting board 17 for each inductor.
  • the mounting substrate 17 is indicated by a dashed line
  • the pads 18a and wiring pads 18b are indicated by broken lines
  • the magnetic core 11 is indicated by long broken lines
  • the first to fourth external electrodes 13a to 13d are indicated by solid lines.
  • a wiring pattern 19a connected to the pad 18a of each inductor 10 and a wiring pattern 19b connected to the pad 18b are provided on the mounting substrate 17.
  • the wiring pattern 19a is indicated by a dotted line
  • the wiring pattern 19b is indicated by a two-dot chain line.
  • the external electrodes 13 are drawn out to the first end surface 11e side or the second end surface 11f side, but as shown in FIG. Alternatively, it may be pulled out toward the second side surface 11d.
  • the second external electrode 13b and the fourth external electrode 13d are led out to the second side surface 11d.
  • the inductance values of the first inductor 10A and the second inductor 10B (the sum of the first coil element and the third coil element, and the second coil element and the fourth coil element) is about 120 nH
  • the DC resistance of each of the first inductor 10A and the second inductor 10B is about 0.5 m ⁇
  • the coupling coefficient is about 0.98. be able to.
  • the inductor according to the present disclosure is industrially useful because it is small, can handle large currents, and has a large coupling coefficient.

Abstract

The purpose of the present invention is to obtain an inductor which has a small size, can deal with a large current, and has a large coupling coefficient. This inductor (10) comprises a magnetic core (11) and a coil element (12) embedded in the magnetic core (11). The coil element (12) is composed of at least four flat plate coils in which a first coil element (12a), a second coil element (12b), a third coil element (12c), and a fourth coil element (12d) are provided in a superimposed manner. End sections of the coil element (12) each protrude from a bottom surface (11a) and are bent along the bottom surface (11a), thereby forming an external electrode (13). End sections of the first coil element (12a) and end sections of the third coil element (12c) are bent toward a first side surface (11c). End sections of the second coil element (12b) and end sections of the fourth coil element (12d) are bent toward a second side surface (11d).

Description

インダクタinductor
　本開示は、電源回路等に用いられるインダクタに関するものである。 The present disclosure relates to inductors used in power supply circuits and the like.
　近年ＣＰＵ（Central Processing Unit）などの大規模集積回路は、低電圧化が進み、素子に必要とされる所要電流が数十アンペアにまで達するようになるとともに、小型で低背の電源回路が求められている。大電流化に対応するためマルチフェーズの電源方式が主流として使われてきた。そのためこの方式に対応する電源方式としてカップリング方式が用いられてきた。このカップリング方式に使われるインダクタは、複数のコイルが結合係数０．６程度で結合されたインダクタで駆動される。 In recent years, large-scale integrated circuits such as CPUs (Central Processing Units) have become increasingly low voltage, and the required current for the elements has reached several tens of amperes. It is A multi-phase power supply system has been mainly used in order to cope with the increase in current. Therefore, a coupling system has been used as a power supply system corresponding to this system. The inductor used in this coupling system is driven by an inductor in which a plurality of coils are coupled with a coupling coefficient of about 0.6.
　なお、先行技術文献情報として、例えば、特許文献１が知られている。 For example, Patent Document 1 is known as prior art document information.
特開２００８－２３５７７３号公報JP-A-2008-235773
　しかしながらさらに大電流化が要望されると従来のカップリング方式では限界があった。これに対して多相電圧レギュレータと呼ばれる方式が検討されている。この方式の場合複数のコイル間の結合を大幅に大きくする必要があり、カップリング方式に用いられているインダクタでは十分な特性を得ることができなかった。結合係数を上げるためには複数のコイル間の対向面積を大きくする必要があり、従来のカップルドインダクタのような電極取り出しを行うことが難しかった。 However, there were limits to the conventional coupling method when there was a demand for even higher currents. On the other hand, a method called a polyphase voltage regulator is being studied. In this method, it is necessary to significantly increase the coupling between the coils, and the inductor used in the coupling method cannot obtain sufficient characteristics. In order to increase the coupling coefficient, it was necessary to increase the facing area between the multiple coils, and it was difficult to extract the electrodes as in the conventional coupled inductor.
　本開示は、小型で大電流に対応でき、結合係数の大きなインダクタを提供することを目的としている。 An object of the present disclosure is to provide an inductor that is small, can handle large currents, and has a large coupling coefficient.
　上記問題を解決するために、本開示のインダクタは、磁性材料粉と結合剤とを混合して加圧成形した直方体状の磁心と、磁心に埋設されたコイル素子と、を備える。磁心は底面と、底面に対向する天面と、底面と天面とをつなぐ第１の側面と、第１の側面に対向する第２の側面とを有する。コイル素子は、第１の側面側から第２の側面側に向けて順に第１のコイル素子、第２のコイル素子、第３のコイル素子、第４のコイル素子と重ねて設けた、少なくとも４個の平板コイルからなり、第１の側面側から第２の側面側に向けて順に第１のコイル素子、第２のコイル素子、第３のコイル素子、第４のコイル素子と重ねて設けている。第１～第４のコイル素子の端部はそれぞれ底面から突出して底面に沿って折り曲げられて外部電極を構成する。第１のコイル素子につながる外部電極を第１の外部電極、第２のコイル素子につながる外部電極を第２の外部電極、第３のコイル素子につながる外部電極を第３の外部電極、第４のコイル素子につながる外部電極を第４の外部電極とする。第１のコイル素子の各端部および第３のコイル素子の各端部が第１の側面に向けて折り曲げられることにより、それぞれ第１の外部電極および第３の外部電極が設けられる。第２のコイル素子の各端部および第４のコイル素子の各端部が第２の側面に向けて折り曲げられることにより、それぞれ第２の外部電極および第４の外部電極が設けられる。 In order to solve the above problem, the inductor of the present disclosure includes a rectangular parallelepiped magnetic core obtained by mixing magnetic material powder and a binder and press-forming, and a coil element embedded in the magnetic core. The magnetic core has a bottom surface, a top surface facing the bottom surface, a first side surface connecting the bottom surface and the top surface, and a second side surface facing the first side surface. At least four coil elements are provided to overlap the first coil element, the second coil element, the third coil element, and the fourth coil element in order from the first side surface side toward the second side surface side. A first coil element, a second coil element, a third coil element, and a fourth coil element are stacked in order from the first side surface side to the second side surface side. there is The ends of the first to fourth coil elements protrude from the bottom surface and are bent along the bottom surface to form external electrodes. The external electrode connected to the first coil element is the first external electrode, the external electrode connected to the second coil element is the second external electrode, the external electrode connected to the third coil element is the third external electrode, and the fourth The external electrode connected to the coil element of is the fourth external electrode. A first external electrode and a third external electrode are provided by bending each end of the first coil element and each end of the third coil element toward the first side surface. Each end of the second coil element and each end of the fourth coil element are bent toward the second side surface to provide a second external electrode and a fourth external electrode, respectively.
　上記構成により小型で大電流に対応でき、結合係数の大きなインダクタを提供することができる。 With the above configuration, it is possible to provide an inductor that is compact, can handle large currents, and has a large coupling coefficient.
本開示の一実施の形態におけるインダクタの斜視図1 is a perspective view of an inductor according to an embodiment of the present disclosure; FIG. 本開示の一実施の形態におけるインダクタの側面図Side view of an inductor according to an embodiment of the present disclosure 本開示の一実施の形態におけるインダクタの下面図A bottom view of an inductor according to an embodiment of the present disclosure 本開示の一実施の形態におけるインダクタの端面図FIG. 4 is an end view of an inductor in accordance with an embodiment of the present disclosure; 本開示の一実施の形態におけるインダクタを実装基板に実装して使用したときの上面透視図FIG. 2 is a top perspective view when the inductor according to the embodiment of the present disclosure is mounted on a mounting substrate and used; 本開示の一実施の形態におけるインダクタの第１のコイル素子の平面図FIG. 4 is a plan view of a first coil element of an inductor according to an embodiment of the present disclosure; 本開示の一実施の形態におけるインダクタの第２のコイル素子の平面図A plan view of a second coil element of an inductor according to an embodiment of the present disclosure 本開示の一実施の形態におけるインダクタの第３のコイル素子の平面図A plan view of a third coil element of an inductor according to an embodiment of the present disclosure 本開示の一実施の形態におけるインダクタの第４のコイル素子の平面図A plan view of a fourth coil element of an inductor according to an embodiment of the present disclosure 本開示の一実施の形態の変形例におけるインダクタの底面側外観図FIG. 11 is a bottom side external view of an inductor in a modification of an embodiment of the present disclosure; 本開示の一実施の形態の変形例におけるインダクタを実装基板に実装して使用したときの上面透視図FIG. 5 is a top perspective view when the inductor in the modified example of the embodiment of the present disclosure is mounted on a mounting substrate and used;
　以下、本開示の一実施の形態におけるインダクタ１０について、図面を参照しながら説明する。 An inductor 10 according to an embodiment of the present disclosure will be described below with reference to the drawings.
　図１は本開示の一実施の形態におけるインダクタ１０の底面１１ａ側からインダクタ１０を見たときの斜視図である。図２Ａ～図２Ｃは本開示の一実施の形態におけるインダクタ１０の外観図である。図２Ａは本開示の一実施の形態におけるインダクタ１０の第１の側面１１ｃ側からインダクタ１０を見たときの側面図である。図２Ｂはインダクタ１０の底面１１ａ側からインダクタ１０を見たときの下面図である。図２Ｃはインダクタ１０の第１の端面１１ｆ側からインダクタ１０を見たときの端面図である。なお図２Ａ～図２Ｃでは内部のコイル素子１２は破線で示している。なお、図１～図６におけるインダクタ１０に関し、第１の端面１１ｅから第２の端面１１ｆへ向かう方向を正の方向としてｘ軸を設け、第４のコイル素子１２ｄから第１のコイル素子１２ａへ向かう方向を正の方向としてｙ軸を設け、インダクタ１０の底面１１ａから天面１１ｂへ向かう方向を正の方向としてｚ軸を設けることとする。すなわち、図１～図６にはｘｙｚ直交座標系が示されている。 FIG. 1 is a perspective view of the inductor 10 viewed from the bottom surface 11a side of the inductor 10 according to the embodiment of the present disclosure. 2A to 2C are external views of inductor 10 according to an embodiment of the present disclosure. FIG. 2A is a side view of inductor 10 viewed from the first side surface 11c side of inductor 10 according to an embodiment of the present disclosure. FIG. 2B is a bottom view of the inductor 10 viewed from the side of the bottom surface 11a of the inductor 10. FIG. FIG. 2C is an end view of the inductor 10 viewed from the first end face 11f side of the inductor 10. FIG. 2A to 2C, the internal coil element 12 is indicated by broken lines. Regarding the inductor 10 in FIGS. 1 to 6, the direction from the first end surface 11e to the second end surface 11f is set as the positive direction, and the x-axis is provided. The y-axis is provided with the facing direction as the positive direction, and the z-axis is provided with the direction from the bottom surface 11a to the top surface 11b of the inductor 10 as the positive direction. That is, FIGS. 1 to 6 show an xyz orthogonal coordinate system.
　本開示の一実施の形態におけるインダクタ１０は、Ｆｅ－Ｓｉ－Ｃｒの粉からなる磁性材料粉とシリコーンからなる結合剤とを混合して加圧成形した直方体状の磁心１１と、この磁心１１に埋設されたコイル素子１２とからなっている。磁心１１の外形形状は幅（ｙ軸方向）約６ｍｍ、長さ（ｘ軸方向）約１３ｍｍ、高さ（ｚ軸方向）約５ｍｍの直方体状である。また、磁心１１は、コイル素子１２の端部が突出する底面１１ａと、底面１１ａに対向する天面１１ｂと、底面１１ａと天面１１ｂとをつなぐ第１の側面１１ｃと、第１の側面１１ｃに対向する第２の側面１１ｄと、第１の側面１１ｃと第２の側面１１ｄとをつなぐ第１の端面１１ｅと、第１の端面１１ｅに対向する第２の端面１１ｆとを有している。 An inductor 10 according to an embodiment of the present disclosure includes a rectangular parallelepiped magnetic core 11 formed by mixing a magnetic material powder made of Fe—Si—Cr powder and a binder made of silicone and press-molding the magnetic core 11. and an embedded coil element 12 . The outer shape of the magnetic core 11 is a rectangular parallelepiped with a width (y-axis direction) of about 6 mm, a length (x-axis direction) of about 13 mm, and a height (z-axis direction) of about 5 mm. Further, the magnetic core 11 includes a bottom surface 11a from which the ends of the coil elements 12 protrude, a top surface 11b facing the bottom surface 11a, a first side surface 11c connecting the bottom surface 11a and the top surface 11b, and a first side surface 11c. , a first end face 11e connecting the first side face 11c and the second side face 11d, and a second end face 11f facing the first end face 11e. .
　磁心１１の内部には、それぞれ平板よりなる４個のコイル素子１２が埋設されている。磁心１１の第１の側面１１ｃ側から第２の側面１１ｄ側に向けて順に、第１のコイル素子１２ａ、第２のコイル素子１２ｂ、第３のコイル素子１２ｃ、第４のコイル素子１２ｄが、それぞれ隣接コイル素子の側面が対向するように埋設されている。各コイル素子１２の端部はそれぞれ磁心１１の底面１１ａから突出し、底面１１ａに沿って折り曲げられることによって外部電極１３を構成している。各コイル素子１２は、銅板を打ち抜いて形成されたもので、厚さ約０．４ｍｍ、コイルパターンの幅を約０．８ｍｍとしている。さらに磁心１１に埋設される部分の各コイル素子１２の表面は、厚さ約０．０３ｍｍのエポキシ樹脂、フェノール樹脂またはアクリル樹脂等からなる絶縁層１６がパッド印刷等により設けられている。 Four coil elements 12 each made of a flat plate are embedded inside the magnetic core 11 . A first coil element 12a, a second coil element 12b, a third coil element 12c, and a fourth coil element 12d are arranged in order from the first side surface 11c side of the magnetic core 11 toward the second side surface 11d side, Adjacent coil elements are embedded such that the side surfaces thereof are opposed to each other. An end portion of each coil element 12 protrudes from the bottom surface 11a of the magnetic core 11 and is bent along the bottom surface 11a to form an external electrode 13 . Each coil element 12 is formed by punching a copper plate, and has a thickness of about 0.4 mm and a coil pattern width of about 0.8 mm. Furthermore, on the surface of each coil element 12 embedded in the magnetic core 11, an insulating layer 16 made of epoxy resin, phenol resin, acrylic resin, or the like and having a thickness of about 0.03 mm is provided by pad printing or the like.
　ここで第１のコイル素子１２ａにつながる外部電極を第１の外部電極１３ａ、第２のコイル素子１２ｂにつながる外部電極を第２の外部電極１３ｂ、第３のコイル素子１２ｃにつながる外部電極を第３の外部電極１３ｃ、第４のコイル素子１２ｄにつながる外部電極を第４の外部電極１３ｄと称する。第１のコイル素子１２ａの各端部および第３のコイル素子１２ｃの各端部は第１の側面１１ｃに向けて折り曲げられることにより、それぞれ第１の外部電極１３ａおよび第３の外部電極１３ｃを構成する。第２のコイル素子１２ｂの各端部および第４のコイル素子１２ｄの各端部は第２の側面１１ｄに向けて折り曲げられることにより、それぞれ第２の外部電極１３ｂおよび第４の外部電極１３ｄを構成する。さらに第１の外部電極１３ａ、第２の外部電極１３ｂ、第３の外部電極１３ｃ、第４の外部電極１３ｄの各々は、第１の端面１１ｅまたは第２の端面１１ｆの方向すなわちｘ軸に沿う方向に延伸され、先端部分が第１の端面１１ｅまたは第２の端面１１ｆに沿って折り曲げられている。このようにコイル素子１２の端部を底面１１ａから突出させて折り曲げて外部電極１３を構成することにより、実装面積の小さいインダクタ１０を得ることができる。 Here, the external electrode connected to the first coil element 12a is the first external electrode 13a, the external electrode connected to the second coil element 12b is the second external electrode 13b, and the external electrode connected to the third coil element 12c is the third external electrode. An external electrode connected to the third external electrode 13c and the fourth coil element 12d is called a fourth external electrode 13d. Each end of the first coil element 12a and each end of the third coil element 12c are bent toward the first side surface 11c to form the first external electrode 13a and the third external electrode 13c, respectively. Configure. Each end of the second coil element 12b and each end of the fourth coil element 12d are bent toward the second side surface 11d to form the second external electrode 13b and the fourth external electrode 13d, respectively. Configure. Furthermore, each of the first external electrode 13a, the second external electrode 13b, the third external electrode 13c, and the fourth external electrode 13d extends in the direction of the first end surface 11e or the second end surface 11f, that is, along the x-axis. direction, and the tip portion is bent along the first end surface 11e or the second end surface 11f. Inductor 10 with a small mounting area can be obtained by forming external electrode 13 by bending the ends of coil element 12 so as to protrude from bottom surface 11a.
　また磁心１１の底面１１ａには、コイル素子１２が突出する部分を含み、第１の側面１１ｃと第２の側面１１ｄとをつなぐ領域に深さ約０．４ｍｍの凹部１５を設けている。底面１１ａからコイル素子１２の端部を突出させ、底面１１ａに沿って曲げると、どうしても曲げる部分でふくらみが生じ、実装するときに安定性が悪くなる。そこで本実施の形態のように、磁心１１の底面１１ａに設けた凹部１５からコイル素子１２の端部を突出させることにより、このインダクタの実装面の平坦性を向上させることができる。凹部１５の深さは、外部電極１３の厚みの８０％以上、２００％以下とすることが望ましい。凹部の深さが外部電極の厚みの８０％よりも浅くなると平坦性が悪くなる。逆に２００％を超えるとコアの体積が小さくなってインダクタンス値が下がってしまうので好ましくない。 In addition, the bottom surface 11a of the magnetic core 11 is provided with a recess 15 having a depth of about 0.4 mm in a region that includes a portion where the coil element 12 protrudes and connects the first side surface 11c and the second side surface 11d. If the end of the coil element 12 protrudes from the bottom surface 11a and is bent along the bottom surface 11a, the bent portion inevitably bulges, resulting in poor mounting stability. Therefore, by protruding the ends of the coil elements 12 from the recesses 15 provided in the bottom surface 11a of the magnetic core 11 as in the present embodiment, the flatness of the mounting surface of the inductor can be improved. The depth of the concave portion 15 is desirably 80% or more and 200% or less of the thickness of the external electrode 13 . If the depth of the concave portion is shallower than 80% of the thickness of the external electrode, the flatness is deteriorated. Conversely, if it exceeds 200%, the volume of the core becomes small and the inductance value decreases, which is not preferable.
　以上のようにインダクタ１０を構成する。 The inductor 10 is configured as described above.
　図３は、本開示のインダクタ１０を実装基板１７に実装して使用したときの上面透視図である。図３では、３相の多相電圧レギュレータに使用した場合の例を示している。インダクタ１０は１相毎に１個用いられる。図３では、３相の多相電圧レギュレータの３つのインダクタ１０の周辺を示している。３つのインダクタ１０は、第1の側面１１ｃと第２の側面１１ｄが対向するように配置されている。１個のインダクタ毎にパッド１８ａおよびパッド１８ｂが、実装基板１７上に設けられている。図３において、実装基板１７は一点鎖線、パッド１８ａおよびパッド１８ｂは破線、磁心１１は長破線、第１の外部電極１３ａ～第４の外部電極１３ｄは実線にて示されている。実装基板１７上で隣り合う第１の外部電極１３ａと第３の外部電極１３ｃとをパッド１８ａでつなぎ合わせて第１のインダクタ１０Ａを形成し、隣り合う第２の外部電極１３ｂと第４の外部電極１３ｄとをパッド１８ｂでつなぎ合わせて第２のインダクタ１０Ｂを形成するようにして使用する。このようにすることにより、第１のインダクタ１０Ａである第１のコイル素子１２ａと第３のコイル素子１２ｃとの間に第２のインダクタ１０Ｂである第２のコイル素子１２ｂが挟まれ、第２のインダクタ１０Ｂである第２のコイル素子１２ｂと第４のコイル素子１２ｄとの間に第１のインダクタ１０Ａである第３のコイル素子１２ｃが挟まれている状態となっている。さらに磁心１１の中に埋設されているすべての領域にわたって一つのコイル素子１２（第１のコイル素子１２ａ～第４のコイル素子１２ｄのうちいずれか１つ）が少なくとも一つの他のコイル素子１２（第１のコイル素子１２ａ～第４のコイル素子１２ｄのうち少なくとも１つ）と重なり合う状態となるため、第１のインダクタ１０Ａと第２のインダクタ１０Ｂとの間で結合係数が高いインダクタ１０を得ることができる。 FIG. 3 is a top perspective view when the inductor 10 of the present disclosure is mounted on the mounting board 17 and used. FIG. 3 shows an example of use in a three-phase multiphase voltage regulator. One inductor 10 is used for each phase. FIG. 3 shows the periphery of three inductors 10 of a three-phase multiphase voltage regulator. The three inductors 10 are arranged such that the first side 11c and the second side 11d face each other. A pad 18a and a pad 18b are provided on the mounting board 17 for each inductor. In FIG. 3, the mounting board 17 is indicated by a dashed line, the pads 18a and 18b are indicated by broken lines, the magnetic core 11 is indicated by long broken lines, and the first to fourth external electrodes 13a to 13d are indicated by solid lines. Adjacent first external electrode 13a and third external electrode 13c on mounting substrate 17 are connected by pad 18a to form first inductor 10A, and adjacent second external electrode 13b and fourth external electrode are connected. The electrode 13d is connected with the pad 18b to form the second inductor 10B. By doing so, the second coil element 12b, which is the second inductor 10B, is sandwiched between the first coil element 12a, which is the first inductor 10A, and the third coil element 12c. The third coil element 12c, which is the first inductor 10A, is sandwiched between the second coil element 12b, which is the inductor 10B, and the fourth coil element 12d. Further, one coil element 12 (any one of the first coil element 12a to the fourth coil element 12d) is connected to at least one other coil element 12 ( At least one of the first coil element 12a to the fourth coil element 12d), so that the inductor 10 having a high coupling coefficient between the first inductor 10A and the second inductor 10B can be obtained. can be done.
　そして、図３に示した３相の多層電圧レギュレータの例では、各インダクタ１０のパッド１８ａにつながる配線パターン１９ａおよびパッド１８ｂにつながる配線パターン１９ｂが実装基板１７上に設けられている。図３において、配線パターン１９ａは点線、配線パターン１９ｂは二点鎖線にて示されている。配線パターン１９ａは、それぞれ多相電圧レギュレータの１相毎のレギュレータ回路に接続される。また、配線パターン１９ｂは、３つの第２のインダクタ１０Ｂを直列に接続している。この、３つの第２のインダクタ１０Ｂが直列に接続された両端の配線パターン１９ｂは、それぞれグランド（ＧＮＤ）に接続される。３つの第２のインダクタ１０Ｂが直列に接続されことによって３つの第１のインダクタ１０Ａを磁気結合させて使用する。本実施の形態では、第１のインダクタ１０Ａと第２のインダクタ１０Ｂとの間で結合係数を高くできるため、３つの第１のインダクタ１０Ａ相互の磁気結合を高くすることができる。 In the example of the three-phase multi-layer voltage regulator shown in FIG. In FIG. 3, the wiring pattern 19a is indicated by a dotted line, and the wiring pattern 19b is indicated by a two-dot chain line. The wiring pattern 19a is connected to a regulator circuit for each phase of the multiphase voltage regulator. Also, the wiring pattern 19b connects the three second inductors 10B in series. The wiring patterns 19b at both ends to which the three second inductors 10B are connected in series are each connected to the ground (GND). By connecting the three second inductors 10B in series, the three first inductors 10A are magnetically coupled for use. In this embodiment, since the coupling coefficient between the first inductor 10A and the second inductor 10B can be increased, the mutual magnetic coupling between the three first inductors 10A can be increased.
　ここでコイル素子１２についてさらに詳細に説明する。図４Ａは第１のコイル素子１２ａの平面図、図４Ｂは第２のコイル素子１２ｂの平面図、図４Ｃは第３のコイル素子１２ｃの平面図、図４Ｄは第４のコイル素子１２ｄの平面図である。図４Ａ～図４Ｄでは、これらの第１のコイル素子１２ａ～第４のコイル素子１２ｄが磁心１１に埋設された時の磁心１１の外形を破線で示している。破線の外に突出している第１のコイル素子１２ａ～第４のコイル素子１２ｄの端部は、埋設された後、底面１１ａに沿って折り曲げられることにより、それぞれ第１の外部電極１３ａ～第４の外部電極１３ｄを構成する。また図４Ａ～図４Ｄでは第１の部分～第７の部分の領域をわかりやすくするため、それらの境界を一点鎖線で示している。 Here, the coil element 12 will be explained in more detail. 4A is a plan view of the first coil element 12a, FIG. 4B is a plan view of the second coil element 12b, FIG. 4C is a plan view of the third coil element 12c, and FIG. 4D is a plan view of the fourth coil element 12d. It is a diagram. In FIGS. 4A to 4D, broken lines show the outer shape of the magnetic core 11 when the first to fourth coil elements 12a to 12d are embedded in the magnetic core 11. FIG. The ends of the first to fourth coil elements 12a to 12d protruding outside the dashed line are embedded and then bent along the bottom surface 11a to form the first external electrodes 13a to the fourth coil elements 13a to 4th coil elements 12d, respectively. constitute the external electrode 13d. In addition, in FIGS. 4A to 4D, the boundaries between the first to seventh portions are indicated by dashed lines in order to make the regions of the first to seventh portions easier to understand.
　第１のコイル素子１２ａ～第４のコイル素子１２ｄの各々は、磁心１１の内部において、それぞれ、以下の（ａ）～（ｇ）に示す構成を有する。 Inside the magnetic core 11, each of the first coil element 12a to the fourth coil element 12d has the configuration shown in (a) to (g) below.
　（ａ）底面１１ａから天面１１ｂに向かって延びる第１の部分１２ｅ。 (a) A first portion 12e extending from the bottom surface 11a toward the top surface 11b.
　（ｂ）第１の部分１２ｅの天面１１ｂ側の端につながり第１の端面１１ｅ側に延びる第２の部分１２ｆ。 (b) A second portion 12f connected to the end of the first portion 12e on the side of the top surface 11b and extending toward the first end surface 11e.
　（ｃ）第２の部分１２ｆの天面１１ｂ側かつ第１の端面１１ｅ側の端につながり天面１１ｂ側に延びる第３の部分１２ｇ。 (c) A third portion 12g connected to the end of the second portion 12f on the top surface 11b side and the first end surface 11e side and extending toward the top surface 11b side.
　（ｄ）第３の部分１２ｇの天面１１ｂ側の端につながり第２の端面１１ｆ側に延びる第４の部分１２ｈ。 (d) A fourth portion 12h connected to the top surface 11b side end of the third portion 12g and extending toward the second end surface 11f side.
　（ｅ）第４の部分１２ｈの底面１１ａ側かつ第２の端面１１ｆ側の端につながり底面１１ａ側に延びる第５の部分１２ｉ。 (e) A fifth portion 12i connected to the end of the fourth portion 12h on the bottom surface 11a side and the second end surface 11f side and extending toward the bottom surface 11a side.
　（ｆ）第５の部分１２ｉの底面１１ａ側の端につながり第１の端面１１ｅ側に延びる第６の部分１２ｊ。 (f) A sixth portion 12j connected to the end of the fifth portion 12i on the bottom surface 11a side and extending toward the first end surface 11e.
　（ｇ）第６の部分１２ｊの底面１１ａ側かつ第１の端面１１ｅ側の端につながり底面１１ａ側に延びる第７の部分１２ｋ。 (g) A seventh portion 12k connected to the end of the sixth portion 12j on the bottom surface 11a side and the first end surface 11e side and extending toward the bottom surface 11a side.
　また、第１のコイル素子１２ａ～第４のコイル素子１２ｄのそれぞれの底面１１ａ側の端部は、それぞれ第１の部分１２ｅおよび第７の部分１２ｋの端から磁心１１の底面１１ａに突出され、磁心１１の底面１１ａに沿って折り曲げられることにより、それぞれ第１の外部電極１３ａ～第４の外部電極１３ｄを構成している。 The ends of the first to fourth coil elements 12a to 12d on the side of the bottom surface 11a project from the ends of the first portion 12e and the seventh portion 12k to the bottom surface 11a of the magnetic core 11, By bending along the bottom surface 11a of the magnetic core 11, the first to fourth external electrodes 13a to 13d are formed, respectively.
　第１のコイル素子１２ａおよび第２のコイル素子１２ｂの、第２の部分１２ｆおよび第６の部分１２ｊの長さ（図４ＡのＬ１）は、第３のコイル素子１２ｃおよび第４のコイル素子１２ｄの、第２の部分１２ｆおよび第６の部分１２ｊの長さ（図４ＣのＬ２）に比べて、コイルパターンの幅の分よりも長く形成されている。 The lengths of the second portion 12f and the sixth portion 12j (L1 in FIG. 4A) of the first coil element 12a and the second coil element 12b are equal to those of the third coil element 12c and the fourth coil element 12d. is longer than the width of the coil pattern compared to the lengths of the second portion 12f and the sixth portion 12j (L2 in FIG. 4C).
　そして第１のコイル素子１２ａと第２のコイル素子１２ｂとは、磁心１１に埋設されているすべての経路で重なり合い、第３のコイル素子１２ｃと第４のコイル素子１２ｄとは、磁心１１に埋設されているすべての経路で重なり合っている。さらに第３の部分１２ｇ～第５の部分１２ｉでは、第１のコイル素子１２ａ、第２のコイル素子１２ｂ、第３のコイル素子１２ｃ、および第４のコイル素子１２ｄがすべて重なり合っている。このようにすることにより、第１のインダクタ１０Ａと第２のインダクタ１０Ｂとの間で大きな結合係数を得ることができる。 The first coil element 12a and the second coil element 12b overlap in all paths embedded in the magnetic core 11, and the third coil element 12c and the fourth coil element 12d are embedded in the magnetic core 11. are overlapped in all paths that are Furthermore, in the third portion 12g to the fifth portion 12i, the first coil element 12a, the second coil element 12b, the third coil element 12c, and the fourth coil element 12d all overlap. By doing so, a large coupling coefficient can be obtained between the first inductor 10A and the second inductor 10B.
　なお、第３のコイル素子１２ｃと第４のコイル素子１２ｄは、第１、第２、第６、第７の部分を形成せずに、第３の部分、第５の部分を底面まで延ばして形成してもよいが、各コイル素子の第２および第６の部分の少なくとも一部が重なることにより、複数のコイル間の結合係数を大きくできるので好ましい。また図４Ａ～図４Ｄでは、コイルのループが矩形状となっているが、ループに丸みを帯びたΩ字状としても構わない。 The third coil element 12c and the fourth coil element 12d do not form the first, second, sixth, and seventh parts, but extend the third part and the fifth part to the bottom surface. Although it may be formed, it is preferable that at least a part of the second and sixth portions of each coil element overlap each other because the coupling coefficient between the plurality of coils can be increased. Also, in FIGS. 4A to 4D, the loops of the coils are rectangular, but the loops may be rounded Ω-shaped.
　以上に説明した構成により、底面１１ａで第２のコイル素子１２ｂの端部と第３のコイル素子１２ｃの端部とが近接して対向する領域ができる。この対向する領域で第２のコイル素子１２ｂの端部および第３のコイル素子１２ｃの端部が導電性を有する状態となっていると、実装時に短絡が起こりやすくなる。そこで第２のコイル素子１２ｂの端部と第３のコイル素子１２ｃの端部とが対向する領域に絶縁層１４を設けておくことが望ましい。なお図２Ｂでは、わかりやすくするために絶縁層１４を設けた部分に斜線を施している。この絶縁層１４は磁心１１に埋設される部分のコイル素子１２に絶縁層を形成するときに同時に設けておくことが望ましい。このようにすることにより工程の簡略化を図ることができる。 With the configuration described above, a region is formed on the bottom surface 11a in which the end of the second coil element 12b and the end of the third coil element 12c are closely opposed to each other. If the end portions of the second coil element 12b and the end portions of the third coil element 12c are conductive in these opposing regions, short circuits are likely to occur during mounting. Therefore, it is desirable to provide the insulating layer 14 in the region where the end of the second coil element 12b and the end of the third coil element 12c face each other. In FIG. 2B, the portion where the insulating layer 14 is provided is hatched for easy understanding. It is desirable that this insulating layer 14 be provided at the same time as the insulating layer is formed on the coil element 12 in the portion embedded in the magnetic core 11 . By doing so, the process can be simplified.
　（変形例）
　図５に本開示の一実施の形態の変形例におけるインダクタ１０の底面１１ａ側からインダクタ１０を見たときの底面側外観図を示す。図６は、この変形例にかかるインダクタ１０を実装基板１７に実装して使用したときの上面透視図である。図６に示す使用例は、図５で説明した使用例と同様に、３相の多相電圧レギュレータに使用した場合の例を示している。インダクタ１０は１相毎に１個用いられる。図６では、３相の多相電圧レギュレータの３つのインダクタ１０の周辺を示している。３つのインダクタ１０は、第１の側面１１ｃと第２の側面１１ｄが対向するように配置されている。１個のインダクタ毎にパッド１８ａおよびパッド１８ｂが実装基板１７上に設けられている。図６において、実装基板１７は一点鎖線、パッド１８ａおよび配線パッド１８ｂは破線、磁心１１は長破線、第１の外部電極１３ａ～第４の外部電極１３ｄは実線にて示されている。また、図６において、各インダクタ１０のパッド１８ａにつながる配線パターン１９ａおよびパッド１８ｂにつながる配線パターン１９ｂが実装基板１７上に設けられている。図６において、配線パターン１９ａは点線、配線パターン１９ｂは二点鎖線にて示されている。 (Modification)
FIG. 5 shows a bottom external view of inductor 10 viewed from the bottom surface 11a side of inductor 10 in a modification of the embodiment of the present disclosure. FIG. 6 is a perspective top view of the inductor 10 according to this modification when it is mounted on a mounting board 17 and used. The example of use shown in FIG. 6 shows an example of use in a three-phase multiphase voltage regulator, like the example of use described in FIG. One inductor 10 is used for each phase. FIG. 6 shows the periphery of three inductors 10 of a three-phase multiphase voltage regulator. The three inductors 10 are arranged such that the first side 11c and the second side 11d face each other. A pad 18a and a pad 18b are provided on the mounting board 17 for each inductor. In FIG. 6, the mounting substrate 17 is indicated by a dashed line, the pads 18a and wiring pads 18b are indicated by broken lines, the magnetic core 11 is indicated by long broken lines, and the first to fourth external electrodes 13a to 13d are indicated by solid lines. 6, a wiring pattern 19a connected to the pad 18a of each inductor 10 and a wiring pattern 19b connected to the pad 18b are provided on the mounting substrate 17. As shown in FIG. In FIG. 6, the wiring pattern 19a is indicated by a dotted line, and the wiring pattern 19b is indicated by a two-dot chain line.
　図１および図２Ａ～図２Ｃでは外部電極１３を第１の端面１１ｅ側または第２の端面１１ｆ側に引き出しているが、図５のように一部の外部電極１３を第１の側面１１ｃ側または第２の側面１１ｄ側に引き出しても構わない。図５、図６に示した例では第２の外部電極１３ｂおよび第４の外部電極１３ｄを第２の側面１１ｄ側に引き出している。このようにすることにより、実装基板１７での配線パターン１９ａ、１９ｂの自由度を向上させることができる。特に、第２のインダクタ１０Ｂを直列に接続する配線パターン１９ｂを図３に示した例よりも短くすることができ、配線パターン１９ｂの直流抵抗を低減することができる。この結果、多相電圧レギュレータの損失を低減することができる。 1 and FIGS. 2A to 2C, the external electrodes 13 are drawn out to the first end surface 11e side or the second end surface 11f side, but as shown in FIG. Alternatively, it may be pulled out toward the second side surface 11d. In the examples shown in FIGS. 5 and 6, the second external electrode 13b and the fourth external electrode 13d are led out to the second side surface 11d. By doing so, the degree of freedom of the wiring patterns 19a and 19b on the mounting board 17 can be improved. In particular, the wiring pattern 19b that connects the second inductor 10B in series can be made shorter than the example shown in FIG. 3, and the DC resistance of the wiring pattern 19b can be reduced. As a result, losses in the multiphase voltage regulator can be reduced.
　以上のように構成することにより、第１のインダクタ１０Ａおよび第２のインダクタ１０Ｂの、それぞれのインダクタンス値（第１のコイル素子と第３のコイル素子とを合わせたもの、および第２のコイル素子と第４のコイル素子とを合わせたもの）が約１２０ｎＨ、第１のインダクタ１０Ａおよび第２のインダクタ１０Ｂの、それぞれの直流抵抗が約０．５ｍΩ、結合係数が約０．９８のインダクタを得ることができる。 With the above configuration, the inductance values of the first inductor 10A and the second inductor 10B (the sum of the first coil element and the third coil element, and the second coil element and the fourth coil element) is about 120 nH, the DC resistance of each of the first inductor 10A and the second inductor 10B is about 0.5 mΩ, and the coupling coefficient is about 0.98. be able to.
　本開示に係るインダクタは、小型で大電流に対応でき、結合係数の大きなインダクタを得ることができ、産業上有用である。 The inductor according to the present disclosure is industrially useful because it is small, can handle large currents, and has a large coupling coefficient.
　１０　インダクタ
　１０Ａ　第１のインダクタ
　１０Ｂ　第２のインダクタ
　１１　磁心
　１１ａ　底面
　１１ｂ　天面
　１１ｃ　第１の側面
　１１ｄ　第２の側面
　１１ｅ　第１の端面
　１１ｆ　第２の端面
　１２　コイル素子
　１２ａ　第１のコイル素子
　１２ｂ　第２のコイル素子
　１２ｃ　第３のコイル素子
　１２ｄ　第４のコイル素子
　１２ｅ　第１の部分
　１２ｆ　第２の部分
　１２ｇ　第３の部分
　１２ｈ　第４の部分
　１２ｉ　第５の部分
　１２ｊ　第６の部分
　１２ｋ　第７の部分
　１３　外部電極
　１３ａ　第１の外部電極
　１３ｂ　第２の外部電極
　１３ｃ　第３の外部電極
　１３ｄ　第４の外部電極
　１４、１６　絶縁層
　１５　凹部
　１７　実装基板
　１８ａ、１８ｂ　パッド
　１９ａ、１９ｂ　配線パターン 10 inductor 10A first inductor 10B second inductor 11 magnetic core 11a bottom surface 11b top surface 11c first side surface 11d second side surface 11e first end surface 11f second end surface 12 coil element 12a first coil element 12b second 2nd coil element 12c 3rd coil element 12d 4th coil element 12e 1st part 12f 2nd part 12g 3rd part 12h 4th part 12i 5th part 12j 6th part 12k 7th Part 13 External electrode 13a First external electrode 13b Second external electrode 13c Third external electrode 13d Fourth external electrode 14, 16 Insulating layer 15 Recess 17 Mounting substrate 18a, 18b Pad 19a, 19b Wiring pattern

Claims (2)

  1. 　磁性材料粉と結合剤とを混合して加圧成形した直方体状の磁心と、
    　前記磁心に埋設されたコイル素子と、を備え、
    　前記磁心は底面と、前記底面に対向する天面と、前記底面と前記天面とをつなぐ第１の側面と、前記第１の側面に対向する第２の側面とを有し、
    　前記コイル素子は、前記第１の側面から前記第２の側面に向けて順に第１のコイル素子、第２のコイル素子、第３のコイル素子、第４のコイル素子とが重ねて設けられた、少なくとも４個の平板コイルからなり、
    　前記第１～第４のコイル素子の各々の端部はそれぞれ前記底面から突出して前記底面に沿って折り曲げられて外部電極を構成し、
    　前記第１のコイル素子につながる前記外部電極を第１の外部電極、前記第２のコイル素子につながる前記外部電極を第２の外部電極、前記第３のコイル素子につながる前記外部電極を第３の外部電極、前記第４のコイル素子につながる前記外部電極を第４の外部電極として、
    　前記第１のコイル素子の各端部および前記第３のコイル素子の各端部が前記第１の側面に向けて折り曲げられることにより、それぞれ前記第１の外部電極および前記第３の外部電極が設けられ、
    　前記第２のコイル素子の各端部および前記第４のコイル素子の各端部が前記第２の側面に向けて折り曲げられることにより、それぞれ前記第２の外部電極および前記第４の外部電極が設けられている、インダクタ。     a rectangular parallelepiped magnetic core obtained by mixing a magnetic material powder and a binder and molding the mixture;
    and a coil element embedded in the magnetic core,
    The magnetic core has a bottom surface, a top surface facing the bottom surface, a first side surface connecting the bottom surface and the top surface, and a second side surface facing the first side surface,
    The coil element includes a first coil element, a second coil element, a third coil element, and a fourth coil element that are stacked in order from the first side surface toward the second side surface. , consisting of at least four flat plate coils,
    end portions of the first to fourth coil elements protrude from the bottom surface and are bent along the bottom surface to form external electrodes;
    The external electrode connected to the first coil element is a first external electrode, the external electrode connected to the second coil element is a second external electrode, and the external electrode connected to the third coil element is a third external electrode. and the external electrode connected to the fourth coil element as the fourth external electrode,
    By bending each end portion of the first coil element and each end portion of the third coil element toward the first side surface, the first external electrode and the third external electrode are formed. provided,
    By bending each end portion of the second coil element and each end portion of the fourth coil element toward the second side surface, the second external electrode and the fourth external electrode are formed. Inductor provided.
  2. 　前記底面において、前記第２のコイル素子の端部と前記第３のコイル素子の端部とが対向する領域に絶縁層が設けられている、請求項１記載のインダクタ。 2. The inductor according to claim 1, wherein an insulating layer is provided on the bottom surface in a region where the end portion of the second coil element and the end portion of the third coil element face each other.
PCT/JP2022/035256 2021-11-29 2022-09-21 Inductor WO2023095430A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6379307A (en) * 1986-09-22 1988-04-09 Murata Mfg Co Ltd Moltilayered transformer
JPH10335146A (en) * 1997-06-03 1998-12-18 Tdk Corp Inductance element
JP2019153642A (en) * 2018-03-01 2019-09-12 株式会社村田製作所 Surface mount inductor
JP2021100098A (en) * 2019-09-20 2021-07-01 太陽誘電株式会社 Inductor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6379307A (en) * 1986-09-22 1988-04-09 Murata Mfg Co Ltd Moltilayered transformer
JPH10335146A (en) * 1997-06-03 1998-12-18 Tdk Corp Inductance element
JP2019153642A (en) * 2018-03-01 2019-09-12 株式会社村田製作所 Surface mount inductor
JP2021100098A (en) * 2019-09-20 2021-07-01 太陽誘電株式会社 Inductor

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